Notch cutting unit



Nov. 19, 1963 F. L.. I UBELEY NOTCH CUTTING UNIT 2 Sheets-Sheet 1 Filed July 6, 1959 ATTORNEYS Nov. 19, 1963 F. L. LUBELEY NOTCH CUTTING UNIT Filed July e, 1959 2 Sheets-Sheet 2 JNVENTOR. FREDERICK L. UBELEY United States Patent Olice 3,1 l 1,0155 Patented Nov. 19, '1963 g 3,111,055, u INHOTCI-I CUTTING UNIT Frederick Lubeley, Kiel, Wis., assignor to H. G. Weber Company, Inc., Kiel, Wis., a corporation 'of Wisconsin Filed July, 1959, Ser. No. 824,972 1 Claim. (el. :s3-"337) This invention relates 'to'improvements in cutting unit-s and more particularly relates to an improved form of cuting unit adapted to cut a hole or notch in `a traveling we A principal object of the invention is to provide a novel and simplified form of apparatus for positively cutting a hole or notch'in a traveling web.

Another object Aof the invention is to provide a simplified form of cut-ting means for cutting 'holes `or notches in traveling webs so arranged as to avoid tearing of the web or distortion of the hole or notch during the cutting operation.

iStill another object of the invention 'is to provide a novel form of thumb notch cutting unit for 'cutting the thumb notches in traveling webs to be formed into paper bags and Ithe like, in which a positive means is provided for controlling the `cutting unit to effect cutting at various speeds of travel of the web. Y

vThese and other objects of the invention will appear from time Vto time as the following specification proceeds and with reference to the acompanying drawings wherein:

` FIGURE 1 -is a View in side elevation of a -notch cutting u nit constructed in accordance with the invention, with certain parts broken away and certain other parts shown in vertical section; and

FIGURE 2 is an end view of the device shown in FIG- URE 1, with certain parts broken away and certain other parts shown in transverse section.

In the embodiment of the invention illustrated in the drawings, I have .shown a table along which a web or flattened tube (not show-n) is adapted to travel during a forming or bag making operation. The table 10 has parallel spaced rails 11 extending along opposite sides of a throat 12 and spacing the flattened tube or web above the top of the table 10, for travel therealong. The throat 12 is generally rectangular in form and is dened by the inner margins of a support and guide member 13, for the traveling web and secured to the top of the table 10 in registry with a rectangular apertured portion 15 in said table. While I have herein shown a table along which the web travels, it should be understood that the web may travel along a former as well, as is well known to those skilled in the art so not shown herein.

1Movable within the throat 12 and apentured portion 15 of the table 10, is an orbitally traveling knife 16. The knife 16 has a serrated cutting edge 19 and is herein shown as being generally U-shaped in form to cut a generally U-shaped thumb notch in the top -face of a traveling bag or tubular web.

A lower knife 17 is shown by broken lines in FIGURES 1 and 2. The lower knife may he used in place of the upper knife to cut a notch in the lower `face of a tubular traveling web, such as, a paper bag Vand the like.

;The knife 16 is bolted or otherwise secured to a knife arm 21. The knife 17 may be similarly secured to a lower knife arm 22. The knife arms 21 and 22 may in turn be pivotally mounted between the ends of spaced mounting brackets 23 and 24 on pivot pins 25 and 26 respectively. The mounting brackets 23 and 24 are mounted on and spaced along upper and lower drive shafts 27 and 28 respectively, as will hereinafter more clearly appear as the specification proceeds.

It should be understood that either knife 16 or 17 may berused and that when a knife is not in use it is removed from its mounting bracket or the -mounting bracket and knife are bodily removed yfrom the drive shaft therefor.

The drive shaft 28 is rotatably supported adjacent its opposite ends in bearing supports 29, an-d i's rotatably driven lby .power through a suitable motor and geared reduction train indicated generally by reference character 30 (FIGURE 2), and no part of the .present invention so not herein shown or described further. The shafts 27 and 28 rare geared together to rotate at the same speeds in opposite directions of rotation, 'by meshing spur gears 3l and 32 respectively, diagrammatically illustrated in FIGURE 1. The upper shaft 27 is mounted in vertically spaced relation with respect to the top of the table 10 on bearing supports 33, 33, supporting opposite ends of said shaft. I'

` (The mounting bracket 23 for the upper knife 16 is shown in FIGURE 2 las including spaced bracket portions 35, lbetween which a knife arm 21 is pivotally mounted, although similar knife arms may be mounted on each end of said bracket portions, where it is desired that two thumb notches be cut for each revolution of the shaft 27. The bracket portions 35 are retained to the shaft 2,7 as by clamping members 37 having recessed portions 39 engaging the shaft and pulling Vthe bracket portions into engagement with the shaft as by machine screws 40, eX- t'ending through said clamping members and threaded within the lbracket portions 35.

'Referring now to the control -means for the knife arm 21, a cam 43 is shown as being mounted on a reduced end portion 44 of a stationary sleeve 45, mounted on a support 46 fbolted or otherwise secured yto the inner vface of the bearing `support 33, and braced by a gusset plate 47. The cam 43 is shown as abutting a flange 49, mounted on the sleeve 45 adjacent the reduced diameter portion 44 thereof. The ange 49 has arcuate slots 50l formed therein, :through which extend machine screws or like securing devices v51, threaded within the cam 43 and affording a means for adjusting the position of said cam with respect to the ange 49.

The cam 43 has a cam face 53 of increasing radius in the general form of a spiral terminating at a high point or peak 54 and dropping olf from said peak along a dropoif face 55, connecting the peak 54 with the low end of the cam face 53. The cam 4face 53 is engaged -by a follower roller 56 on the end of a control arm 57. The follower roller 56 is held in positive contact with the cam face 53 at the high point 54 thereof by a stop plate 58, mounted on an associated bracket portion 3S and engaging the back of the control arm- 57. The cont-rol arm 57 is shown as being mounted on the shaft or pin 25 for pivoting said shaft and the knife arm 21 upon pivotal Imovement of said control arm. As shown in FIGURE 1 the control arm 57 has a split rear end portion 59 which is clamped together by a machine screw 60, clamping said control arm to the shaft 27 for positively turning said shaft upon pivotal movement of said control arm. The knife arm 21 is likewise pinned or otherwise secured to the shaft 27, to be rotated thereby upon rotatable movement of said shaft.

It may be seen `from FIGURE 1, that the peak 54 of the cam face 53 of the cam 43 faces :downwardly and that the stop 5S holds `the control arm :and follower 56 rigid on the high point 54 of the cam 43 holding the knife arm 21 and knife 16 in position to penetrate the web or tube traveling along the table 10, and that after the operation of penetrating the web, the follower 56 will drop olf the high point of the cam, and the stop 58 will accommodate the knife arm 21 and knife 16 to freely travel with the moving web. y

It should here be understood that during the penetration of the moving web, the web is moving faster than the knife 16 and that the knife travels with the web at the termination of the penetrating operation and is raised above the web as it travels therewith upon continued rotation of the arm 23 out of engagement with the web.

The knife 17 on the knife arm 24 is usually only used when Ithe knife 16 is out of use and is controlled by a stationary cam 61 having a peak or high point 63, corresponding to the peak or high point 54 of the cam face 53. A follower roller 65 on a control arm 66 controls movement of the knife 17 and a stop 68 cooperates with said control arm to hold the knife 17 and knife arm 24 rigid as the follower roller 65 reaches the high point of the cam, and the knife 17 penetrates the web (not shown) traveling along the table 10.

The shafts 27 and 28 rotate together in opposite directions to effect .the penetration of the upper side of the web or tube (not shown) vby the knife 16 or penetration of the underside of the web or tube Iby the knife 17 so that either knife penetrates the web or Itube and is then free to travel at the speed of the moving web or tube and to be gradually moved from the cut out portion of the material for la complete cycle of rotation of the associated knife.

It may be seen from the foregoing that a novel and improvedtcutter arrangement has been provided for penetrating a traveling web of material and cutting a thumb notch or aperture therein, in which distortion or tearing of the edges of the cut out portion of the traveling material is eliminated by rigidly holding the knife to penetrate the material, and .then freeing .the knife to travel with the material at the speed of travel thereof, and at the same time moving the knife out of the cut out portion of the material, and then rigidly positioning the knife arm and knife by the gradual rise of the cam, to effect a next succeeding notching or penetrating operation for each cycle of rotation of the knife.

While I have herein shown and described one form in which my invention may be embodied, it may readily be understood that various modifications and variations in the invention may be effected without departing from the spi-rit and scope of the novel concepts thereof as defined by the claim appended hereto.

I claim as my invention:

A cutter for traveling webs and the like, comprising a rotatably driven shaft spaced from and extending transversely of the line of travel ofthe web, a mounting bracket secured to sai-d shaft for rotation therewith and extending radially therefrom, a knife arm pivotally mounted on said mounting bracket for free pivotal movement with respect thereto about an axis extending parallel to the axis of rotation of said shaft and having a knife mounted on and extending from the outer end thereof, cam and follower means controlling relative movement between said knife arm and said mounting bracket comprising a stationary cam extending about said shaft, a control arm extending from said knife arm and rigidly attached thereto and having a follower thereon engaging said stationary cam, said stationary cam having a peak spaced backwardly of a line extending through the axis of said shaft and through the point of web penetration, stop means carried by said mounting bracket and engageable with said knife arm to maintain said follower in contact with the peak of said cam during web penetration, said cam dropping Iolf from said peak and the direction of rotation of said shaft and mounting bracket with respect to said peak being such that the knife will Itravel in the direction of web movement during penetration of the web and said follower will Ibe released from said peak after web penetration and will thereby release said knife to freely move tbackwardly with respect to said stop means and freely travel with the traveling web at the termination of a web penetrating operation.

References Cited in the tile of this patent UNITED STATES PATENTS 2,330,235 Peters Sept. 28, 1943 2,336,957 -Pierce Dec. 14, 1943 2,491,871 Morgan Dec. 20, 1949 2,676,657 INVeber Apr. 24, 1954 2,815,811 LFiertag Dec. 10, 1957 FOREIGN PATENTS 618,832 Germany Sept. '17, 1935 

